Logically, we are not already in the year 2017. We are presently at 2018 which is considered to be the toughest road for cryptoworld it had took since its existence. Let's just wait for the right year to come to see another set of 2017 or even more than that.
well, this year there was a lot of news that made the price of bitcoin down. starting from banned crypto advertisements from social media, to countries that banned bitcoin. well, it certainly becomes a real fear for those who have large amounts of bitcoin, so they panic and sell the bitcoins they have and make prices not grow like 2017.